Wideband Antenna Dual Radiating Elements Bandwidth
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Solution Overview
Problem
Conventional antennas, such as the Planar Inverted-F Antenna (PIFA), face limitations in bandwidth, particularly in high-frequency applications, and suffer from insufficient matching characteristics, which restrict their ability to efficiently transmit and receive radio signals across a broad frequency range while maintaining a compact size.
Innovation Solution
A wideband antenna design incorporating both coupling feed-in and direct feed-in methods, featuring a first and second radiating element, a grounding unit, a shorting unit, and a feeding board with overlapping metal planes, allows for simultaneous improvement of high-frequency bandwidth and low-frequency matching by leveraging the resonance effects generated through these dual feed-in techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional PIFA antenna is used, then the antenna structure is simple and production cost is low, but the bandwidth is limited
Solution Approach 1:
The antenna is divided into two separate radiating elements, each optimized for different frequency bands. The first radiating element handles the first frequency band while the second radiating element handles the second frequency band, allowing each segment to be independently optimized for its specific function, thereby achieving wideband operation without excessive complexity
Solution Approach 2:
The antenna design achieves multi-functionality by enabling operation across two distinct frequency bands through the dual radiating element structure. The shared grounding unit and feeding mechanism allow a single antenna system to perform multiple communication functions simultaneously, improving versatility while maintaining manufacturing simplicity
2Adaptability or versatility
If the bandwidth is extended broadly, then the antenna can cover more frequency ranges, but the size of the antenna increases
Solution Approach 1:
The antenna utilizes the third dimension by employing a planar inverted-F structure that extends vertically from the substrate. The radiating elements are configured to exploit vertical space and three-dimensional current distribution, enabling wideband operation within a compact footprint by transitioning from two-dimensional to three-dimensional electromagnetic resonance
Solution Approach 2:
The antenna structure nests multiple functional components within a compact arrangement. The radiating elements, grounding units, and feeding structures are interlocked and space-efficiently arranged, with components positioned to maximize electromagnetic coupling while minimizing overall volume, allowing broadband performance in a small package
3Adaptability or versatility
If a dualband antenna with two resonance modes is used, then the high frequency bandwidth is increased, but the antenna characteristic is affected if one resonance mode suffers from insufficient bandwidth or frequency shift
Solution Approach 1:
The antenna segments the frequency bands by assigning different radiating elements to different frequency ranges. The first radiating element primarily handles the first frequency band while the second radiating element handles the second frequency band, isolating the resonance modes from each other and preventing frequency shifts in one band from affecting the other, thereby improving characteristic stability
Solution Approach 2:
The feeding board acts as an intermediary structure that couples energy to both radiating elements through controlled impedance transitions. The grounding unit serves as a mediator that provides a common reference potential for both elements, stabilizing the overall antenna characteristics and reducing mutual interference between the two resonance modes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The combined use of coupling and direct feed-in methods enhances the antenna's bandwidth and matching performance, maintaining radiation efficiency around 50% across operating bands, thereby overcoming the limitations of traditional antennas in terms of bandwidth and size.
Implementation Method 1
a first radiating element, for transmitting and receiving wireless signals of a first frequency band
Implementation Method 2
a second radiating element, for transmitting and receiving wireless signals of a second frequency band
Implementation Method 3
generating resonance effect via coupling feed-in and direct feed-in methods
Implementation Method 4
generating resonance effect via coupling feed-in and direct feed-in methods
Data Source
AI summary
A wideband antenna for a radio transceiver device includes a first radiating element for transmitting and receiving wireless signals of a first frequency band, a second radiating element for transmitting and receiving wireless signals of a second frequency band, a grounding unit, a shorting unit having one end electrically connected to the first radiating element and the second radiating element, and another end electrically connected to the grounding unit, and a feeding board including a first feeding metal plane for transmitting wireless signals of the first frequency band and the second frequency band, a second feeding metal plane electrically connected to the second radiating element, and a metal strip electrically connected between the first radiating element and the second radiating element.